package main

import "fmt"

func main() {
	var str map[string]string = make(map[string]string)
	fmt.Println(str == nil)
	str["1"] = "2"
	str["2"] = "1"

	delete(str, "2")
	fmt.Println(str["1"])
	for key, value := range str {
		fmt.Println(key)
		fmt.Println(value)
	}
}
